Among the actors set to travel to San Diego are Kevin Bacon from “The Following”; Nina Dobrev, Paul Wesley and Ian Somerhalder from “The Vampire Diaries”; Jared Padalecki, Jensen Ackles and Misha Collins from “Supernatural”; Grant Gustin from “The Flash”; Matt Ryan and Harold Perrineau from “Constantine”; Joseph Morgan from “The Originals” and Rob Corddry from “Childrens Hospital.”

Also expected to attend are Mike Tyson from “Mike Tyson Mysteries”; cast members from “Gotham”; producer Greg Berlanti from “Arrow” and “The Flash”; Greg Plageman from “Person of Interest”; Julie Plec from “The Vampire Diaries” and “The Originals”; Jason Rothenberg from “The 100”; Rob Thomas and Diane Ruggiero-Wright from “iZombie” and “Veronica Mars”; and Kevin Williamson from “The Following” and “The Vampire Diaries.”

Wednesday’s preview night will also offer fans a chance to see world-premiere screenings of the complete pilot episodes of new WBTV series “The Flash,” “Constantine” and “iZombie,” plus an advance look at a new episode of “Teen Titans Go!”